I don't see what's new here. I already use muscle memory to remember my passwords. I am awful at rote memorization, but when I train my fingers to perform a 12 character password dance, everything is fine and I can remember the password for a long time.

The good thing about memorizing passwords this way is that it doesn't matter how random the password is - totally random letters, numbers and symbols or a sentence are the same when it's a keyboard dance.

As long as you have a keyboard anyway...

I have to find a keyboard to figure out half of my passwords when setting up my phone.